[Bug 1904289] Re: Upgrade fail from gui and terminal

[Victor]

Removing all PPA packages and repositories doesn't help.
Fixed by myself by changing main repo to focal and full-upgrade.

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https://bugs.launchpad.net/bugs/1904289

Title:
  Upgrade fail from gui and terminal

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Try to upgrade from 18.04 to 20.04 from gui and terminal.
  Both don't works for me.
  Disable custom repositories doesn't help.

  Error on upgrade:

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 4.15.0-123.126-generic 4.15.18
  Uname: Linux 4.15.0-123-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Nov 14 19:26:12 2020
  InstallationDate: Installed on 2018-08-17 (819 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-11-13 (0 days ago)

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